Fatty acids consist mainly of carbon and hydrogen, and so fatty acids are a. nonpolar and do not dissolve in water. b. nonpolar and dissolve in water. c. polar and do not dissolve in water. d. polar and dissolve in water.

the answer is a

photosynthesis

introduction of a drug directly into the respiratory tract is a form of inhalation administration.

pure substance: iron,copper

impure substance: water,charcoal

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.